Aeroflot has a very good, extensive website. Good fleet info, seating charts, etc. However, their schedule query has been offline for awhile. probably because it includes domestic flights, and ARIA is international. They are working on updating the site.

Russian airline Transaero also has a very good website, with foreign and domestic flight scheduling, fleet summaries and seating layouts.

I've also enjoyed the websites for British Airways and Air France. Air France and particular is cool because they have a virtual 777 tour.